5.15-stable review patch. If anyone has any objections, please let me know.
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From: Nam Cao namcao@linutronix.de
commit a39087905af9ffecaa237a918a2c03a04e479934 upstream.
pnv_irq_domain_alloc() allocates interrupts at parent's interrupt domain. If it fails in the progress, all allocated interrupts are freed.
The number of successfully allocated interrupts so far is stored "i". However, "i - 1" interrupts are freed. This is broken:
- One interrupt is not be freed
- If "i" is zero, "i - 1" wraps around
Correct the number of freed interrupts to "i".
Fixes: 0fcfe2247e75 ("powerpc/powernv/pci: Add MSI domains") Signed-off-by: Nam Cao namcao@linutronix.de Cc: stable@vger.kernel.org Reviewed-by: Cédric Le Goater clg@redhat.com Signed-off-by: Madhavan Srinivasan maddy@linux.ibm.com Link: https://patch.msgid.link/70f8debe8688e0b467367db769b71c20146a836d.1754300646... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/platforms/powernv/pci-ioda.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2243,7 +2243,7 @@ static int pnv_irq_domain_alloc(struct i return 0;
out: - irq_domain_free_irqs_parent(domain, virq, i - 1); + irq_domain_free_irqs_parent(domain, virq, i); msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, nr_irqs); return ret; }